Great composition. The rock makes the image.
Agreed. The rocks and the silky look of the water really make the picture.
I also agree with JBeckwith, a longer exposure to soften the water might have also looked real nice. But that certainly doesn't take away from the photo you got.
5D mark III, 7D, Sigma 12-24mm II, TS-E 24mm f/3.5L II, 24-70mm f/2.8L II, Sigma 35mm f/1.4, Sigma 50mm f/1.4, 70-200mm f/2.8L IS II, 85mm f/1.2L II, 100mm f/2.8L, 135mm f/2L, 2x TC III